Single-molecule imaging of Bacteroides fragilis AddAB reveals the highly processive translocation of a single motor helicase.

Single-molecule imaging of Bacteroides fragilis AddAB reveals the highly processive translocation of a single motor helicase.
复制标题

DOI:
10.1093/nar/gkq100
复制
发表时间:
2010-06
影响因子:
14.9
通讯作者:
Blakely GW
Blakely GW
中科院分区:
生物学2区
文献类型:
--
作者:
Reuter M;Parry F;Dryden DT;Blakely GW

文献摘要

参考文献

被引文献

相似文献

在许多不具有RecBCD的细菌中,AddAB解旋酶和核酸酶复合体用于修复双链DNA断裂。本研究表明,来自革兰氏阴性条件致病菌脆弱拟杆菌(Bacteroides fragilis)的AddAB可以恢复大肠杆菌recBCD突变体的紫外线敏感性,并且AddAB是脆弱拟杆菌DNA损伤后存活所必需的。通过单分子观察,我们证明了AddAB可以以高达每秒250 bp的速度沿DNA转移,平均可以展开14000 bp,其中一些复合物能够展开40000 bp。这些结果表明,在同源重组过程中,处理性对于促进与修饰酶功能的识别序列相遇的重要性。
The AddAB helicase and nuclease complex is used for repairing double-strand DNA breaks in the many bacteria that do not possess RecBCD. Here, we show that AddAB, from the Gram-negative opportunistic pathogen Bacteroides fragilis, can rescue the ultraviolet sensitivity of an Escherichia coli recBCD mutant and that addAB is required for survival of B. fragilis following DNA damage. Using single-molecule observations we demonstrate that AddAB can translocate along DNA at up to 250 bp per second and can unwind an average of 14 000 bp, with some complexes capable of unwinding 40 000 bp. These results demonstrate the importance of processivity for facilitating encounters with recognition sequences that modify enzyme function during homologous recombination.
DOI: 10.1038/35003501
发表时间: 2000-03-02
期刊: NATURE
影响因子: 64.8
作者:
Cox, MM;Goodman, MF;Marians, KJ
通讯作者: Marians, KJ
DOI: 10.1074/jbc.m600882200
发表时间: 2006-07-07
影响因子: 4.8
作者:
Chedin, Frederic;Handa, Naofumi;Kowalczykowski, Stephen C.
通讯作者: Kowalczykowski, Stephen C.
DOI: 10.1074/jbc.m505520200
发表时间: 2005-11-04
影响因子: 4.8
作者:
Dillingham, MS;Webb, MR;Kowalczykowski, SC
通讯作者: Kowalczykowski, SC
DOI: 10.1073/pnas.242479399
发表时间: 2002-12-10
影响因子: 11.1
作者:
Cheng, W;Brendza, KM;Lohman, TM
通讯作者: Lohman, TM
DOI: 10.1038/nature01673
发表时间: 2003-06-19
期刊: NATURE
影响因子: 64.8
作者:
Dillingham, MS;Spies, M;Kowalczykowski, SC
通讯作者: Kowalczykowski, SC